universal backup directory

[john doe]

I have the following entry in my dotfile:

;; MAKE ALL BACKUPS TO A SINGLE DIRECTORY 
(setq backup-directory-alist `(("." .
,(file-name-nondirectory "~/.emacs_backups"))))
 
This will make backups in the current directory to a
dir called .emacs_backups -- however, is there a way
to make one universal backup directory that all emacs
files go to regardless of where they are saved?

Thanks!

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